Bradley & Renee's Date Night

If there is still anything going on between Bradley Cooper and Jennifer Aniston, it certainly didn’t seem to be on the actor’s mind on Tuesday night as he enjoyed a romantic Manhattan meal with Renée Zellweger.

The pair, who co-star in the upcoming Case 39, were spotted together at Antonucci, an elegant Italian restaurant on NYC’s posh Upper East Side, where one diner tells OK! that this was no friendly chow session.

"He pulled her chair out for her when she sat down and he kissed her on the hand," says the witness. "If they’re just friends, they were being awfully affectionate!"

Renée and Bradley were seated at a corner table, where diners describe their behavior as "flirty," "relaxed" and "cute together."

In a white Henley, jeans and red sneakers, the He’s Just Not That Into You hunk was more casually dressed than his dinner date, who sported a thigh-length black, bell-sleeved dress and strappy shoes with very high heels and carried a Hermes clutch.

"Throughout the dinner they were playful and flirty," a witness tells OK!. "She played with her hair a lot, and she would often touch his arm when she was making a point about something." The lucky celeb-spotter also reveals to OK! that Renée even leaned forward across the table on a few occasions to play with his napkin.

"At one point, he seemed to want to whisper something to her as if it were a secret," says the diner. "He spoke into her ear and then they both started giggling."

Perhaps not wanting the night to end too quickly, the pair remained at their table, sipping tea and chatting long after they finished their food.

When the check arrived, sources tell OK! that both Brad and Renée reached for it. "She told him she wanted to buy him dinner to pay him back for something," says the witness. "And when he opened the check, it already had her card in it!" We’re told this little surprise caused Brad to blurt out, "You [expletive]-er!"

Witnesses also say that the 40-year-old Oscar-winner jokingly referred to herself as a "cougar" because of Bradley’s youthful 34 years.

After conferring over who was supposed to call whom next, the dining duo did their best to throw off the waiting paparazzi by leaving five minutes apart and hopping into separate cabs.